SDL/OpenGL Texture Transparency?

I don't see you enabling blending anywhere. You'll need some variation of.

I don't see you enabling blending anywhere. You'll need some variation of: glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA); glEnable(GL_BLEND); See here: opengl.org/resources/faq/technical/trans....

To hav transparency, you need an alpha channel, on your texture, but more important, in your framebuffer. This is done with SDL_GL_SetAttribute, for example: SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 8 ); SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 ); This will request a framebuffer with at least those sizes, and you'll be able to use blending. Remember to enable blending and set a blending function.

Have a look at your call glTexImage2D( GL_TEXTURE_2D, 0, 3, surface->w, surface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels );. You specify 3 color components for the internal format. Try 4 (with alpha channel), or GL_RGBA (more about this).

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